Abstract
This article elaborates on experimental and analytical studies on the behavior of tube-confined steel-reinforced ultra-high-strength concrete short columns subjected to axial compressive load. A total of 22 specimens were fabricated and tested to investigate the failure mode and axial load behavior of tube-confined steel-reinforced concrete columns. The parameters for the tests include the following: (1) tube shape, (2) the shape of inner steel, (3) the thickness of the steel tube, and (4) tube tensile strength. The test results indicate that the confinement effect of the circular tube is greatly superior to that of the square tube, because the circular tube can prevent the ultra-high-strength concrete from brittle failure more efficaciously. The O-shape of the steel exhibited better mechanical performance than other shapes of the steel. The larger the area of the concrete that could be constrained by the steel shape, the better the performance it could provide. Elastic–plastic analysis of the tube was utilized to investigate the mechanism of tube-confined steel-reinforced concrete columns under axial compression. A bearing capacity formula for tube-confined steel-reinforced concrete columns was proposed based on the test results, which can be used as a reference for further study and guideline for engineering application.
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